add volume widget

include/helpers/systemHelper.hpp

@@ -1,7 +1,10 @@
 #pragma once
 
+#include <array>
 #include <memory>
 #include <string>
+#include <fstream>
+#include <sstream>
 
 class SystemHelper
 {
@@ -25,4 +28,18 @@ class SystemHelper
 
         return result;
     }
+
+    // Read an entire file into a string. Throws std::runtime_error on failure.
+    static std::string read_file_to_string(const std::string &path)
+    {
+        std::ifstream in(path, std::ios::in | std::ios::binary);
+        if (!in)
+        {
+            throw std::runtime_error("Failed to open file: " + path);
+        }
+
+        std::ostringstream ss;
+        ss << in.rdbuf();
+        return ss.str();
+    }
 };